Multiple conduit



July 12, 1949. E. c. PARSONS 2,475,635

MULTIPLE CONDUIT sind Jan. a. 194'5 2 sheets-sheet 1 Inventor wen @ni/amy H July 12, 1949. E C, PARSONS 2,475,635

IULTIPLE coNDUI'r Filed Jan. 8. 1945 asusta-sheet 2 Inventor "y a@ Wwmmy,

Patented July 12, 1949 UNITED STATESl PATENT 'OFFICE The present invention relates to new and useful improvements in multiple conduitsand more specically to a pipe construction composed ol inner and outer coaxial pipe units together with means for spacing the inner pipe within the walls of the outer pipe and also to provide means for connecting sections of the inner and outer pipe units to each other.

An important object of the present invention .is to provide a pipe construction by means of which several fluids may pass through the pipe without contact with each other, the invention being particularly adapted for use in steam and hot water heating plants whereby fluid fromthe feed and return lines may pass through a single conduit, and the invention is also adapted for use in oil pipe lines where a plurality of diiferent types of oil are fed -through the pipes and also in which one of the pipes may be used for conthe oil in cold temperature.

A further object of the invention is to provide a device of this character of simple and practical construction, which is efficient and reliable in performance, relatively inexpensive to manufacture and install in use and otherwise well adapted for the purposes for which the same is intended.

Other objects and advantages reside in the details of construction and operation asmore fully hereinafter described and claimed, reference being had to thev accompanying drawings forming part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a longitudinal sectional view through 35 a multiple pipe embodying one form of the invention.

Figure 2 is a similar view illustrating the use of a T-fltting for connecting the sections of the pipe.

view illustrating a threaded connection for the inner and outer pipes.

Figure 4 is an enlarged fragmentary sectional view illustrating the spacing lug for the inner tional view illustrating a sleeve pipe union for the inner and outer pipes.

Figure 'I is a similar view showing the manner in which the sleeve unions are welded to the respective pipes.

Figure 8 is 3 Claims. (Cl. 13S-6 5) 40 Figure 3 is an enlarged fragmentary sectional tional view illustrating a welded Joint for the pipe sections.

Figure 9 is a fragmentary longitudinal sec tional view of a modified multiple pipe construction, and

Figure 10 is a .transverse'sectionalview'talren substantially on a line In-III of Figure 9.

Referring now to the drawings in detail and first with respect to the form of the invention*A illustrated in Figures 1 to 5, inclusive, the numeral 5 designates a section of the conduit gen- Y erally which is composed of an inner pipe section 6 and an outer-pipe section 1, the inner and outer pipe sections being arranged in coaxial relation and the inner pipe section being secured in spaced relation from the walls of the outer pipe section by means of lugs 8 preferably cast with the pipe,

or which may be welded in position as shown at `9inFigures4and5. veylng a heating fluid to facilitate ,the ow lof 20 'likewise include-lnner and outer pipe sections II and I 2 secured in spaced relation one within the other by means of the lugs I3. One end of the pipe section may also be provided with an elbow of a type shown at I4 in Figure 1 and having an inner pipe section I5 connected to the end of the inner pipe section 6 and extending outwardly through the wall of the elbow to provide an outlet for the fluid passing through the inner pipe section.

In Figure 2 of the drawings I have illustrated the use of a T-iitting I6 for'connecting the adjacent ends of the pipe sections.

As shown in Figures 6 and 7 of the drawings, the pipe sections I1 and I8 may be connected by inner' and outer sleeve joints I9 and 20 slidably other as shown at 23 and the ends of the outer pipe sections 22 connected by a. flller section 24 of a diameter corresponding to that of the outer pipe section and welded thereto as at' 25.

In Figures 9 and 10 of the drawings the inner pipe section 26 and outer pipe section 21 are provided with one or more intermediate pipe sections 28, all secured in coaxial spaced relatior a fragmentary longitudinal secso by means of the lugs'29 so that anincreased 3 nmnberofiiuidsofdiiferenttypemaypass through a common conduit.

Iironcl the foregoing it will he apparent that the inner and outer pipes as shown'inFigures 1 to 8, inclusive, may be used as the feed and return lines in steam or hot water heating plants whereby to reduce the number of conduits generally employed for this purpose and the form of the invention illustrated in Figures 9 and 10 may be employed as an oil pipe line wherein several different types of oil may be simultaneously pumped through a single conduit without contact with cach other and also in'which one of the pipe sections may contain a heated iiuid for heating the oil.

Usual expansion and contraction is provided for by conventional expansion joints, adapted to ilt a multiple pipe conduit.

It is believed that the details of construction andmannerofuseofthedevicewillbereadily understood from.the foregoing without further detailed explanation.

Having thus described the invention, what I claim is:

1. In a conduit-coaxial pipe sections arranged one inside another, and an elbow coupling on one end of one section having a pipe section extending into the same through one side thereof and connected to one end of another pipe section.

2. In a conduit, a pair of outer pipe sections having confronting ends spaced apart, a pair of inner pipe sections in said 'outer pipe sections extending out of said ends of the outer pipe sections and having confronting ends abutting each other, and separate coupling sleeves connecting 4 the confronting ends of the outer pipe sections and the confronting ends of the inner pipe sections respectively.

3. In a conduit, a pair of outer pipe sections having confronting ends spaced apart, a pair of inner pipe sections in said outer sections extending out of said ends of the outer pipe sections and having confronting ends abutting each other and welded together, and a spacer sleeve between the spaced apart ends of the outer pipe sections welded thereto, said outer pipe sections and said sleeve being of the same diameter.

ELBEER C. PARSONS.

REFERENCES CITED' The following referenices are of record in the me of this patent:

UNITED STATES Pli'rrnrrris 

